UPD17072 datasheet(81/228 Pages) RENESAS

номер детали	UPD17072

подробное описание детали	MOS INTEGRATED CIRCUIT

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µPD17072,17073

11.9 External (INT Pin) Interrupts

11.9.1 Outline of external interrupts

Figure 11-9 outlines the external interrupts.

As shown in this figure, an interrupt request for an external interrupt is issued at the rising or falling edge of the

signal input to the INT pin.

Whether the interrupt request is to be issued at the rising or falling edge of INT is specified independently through

program.

The INT pin is Schmitt trigger input pin to protect malfunctioning due to noise. This pin do not accept a pulse input

that lasts for less than 100 ns.

Figure 11-9. Outline of External Interrupt

Remark

INT: detects pin status

IEG: selects interrupt edge

11.9.2 Edge Detection Block

The edge detection block specifies the edge (rising or falling edge) of the input signal that issues the external

interrupt request of the INT pin, and detects the specified edge.

The edge is specified by IEG flag.

Figure 11-10 shows the configuration and function of the interrupt edge select register.

INT pin

INT flag

Schmitt trigger

IEG flag

Edge

detection

block

IRQ flag

Interrupt control block

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